Display screen or portion thereof with user interface



The FIGURE is a front view of a display screen or portion thereof with a user interface that represents our new design.

Broken lines around the FIGURE show a display screen or portion thereof which forms no part of the claimed design. Broken lines within the FIGURE show portions of the user interface which form no part of the claimed design. 

CLAIM The ornamental design for a display screen or portion thereof with user interface, as shown and described. 